Question

an element has 23 electrons 28 neutrons [1] atomic no. [2] mass no. [3] no. of valence electrons *
[1] 28 [2] 23 [3] 5
[1] 23 [2] 28 [3] 3
[1] 23 [2] 51 [3] 3
[1] 23 [2] 51 [3]5​

Answer 1

Answer:

an element has 23 electrons 28 neutrons [1] atomic no. [2] mass no. [3] no. of valence electrons *

[1] 23 [2] 51 [3]5

Explanation:

Atomic number of any element = the number of protons= the number of electrons.

Mass number of any element= the number of proton + the number of neutron.

Number of valence electrons= the total number of electrons present in atom — the total number of electron present nearest noble gas

PLEASE MARK AS BRAINLIEST ANSWER DON'T FORGET TO PRESS ON THANKS

Answer 2

Answer:

[1] 23 [2] 51 [3] 5

Explanation:

number of protons = number of electrons = 23

[1] atomic number = number of protons

= 23

[2] mass number = number of protons + neutrons

= 23 + 28

= 51

[3] no. of valance electrons = electrons present in

last shell

= 5

Hope it's help you.

Mark me as brainlist and please follow me.